78 lines
2.9 KiB
Groff
78 lines
2.9 KiB
Groff
.TH WMMOONCLOCK 1 "21 December 1998"
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.SH NAME
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WMMOONCLOCK \- Dockable Moon Phase Clock
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.SH SYNOPSIS
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.B wmMoonClock
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[\-display <Display>] [\-bc <Color>] [\-lc <Color>] [\-dc <Color>] [\-low] [\-lat <Latitude>] [\-lon <Longitude>] [\-h]
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.SH DESCRIPTION
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.PP
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wmMoonClock displays the current phase of the moon. Clicking on the icon
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brings up different displays \-\- there are 5 in all. The different "pages"
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are;
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.TP
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.B First Page
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Shows the Moon phase image.
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.TP
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.B Second Page
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Shows the current Local Time (LT) and Universal Time (UT), the Moon's Age
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(number of days since last new moon), the geometric (as opposed to temporal)
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fraction of the way through the current lunar cyle (e.g. 50\% for full moon), the
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fraction of the Moon's disc that is illuminated (ratio of area illuminated to
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total area of disc) and whether the Moon is (locally) visible of not (i.e. is
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it above the horizon?).
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.TP
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.B Third Page
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Shows the Rise and Set times for yesterday (first line), today (middle line), and
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tommorrow (last line). If the Moon does not rise or set on a given day a `null
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time' is shown (\-\-:\-\-). Note that these times should still be good for high
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latitude observers. Also note that there will always be at least one (\-\-:\-\-)
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showing up per month. This is because once per month the Moon will rise (set) on
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a given day but will set (rise) in the very early portion of the next day.
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.TP
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.B Fourth Page
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Shows the Moon's horizon coordinates (i.e. the Altitude/Azimuth system). Azimuth is
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measured in degrees CCW from due south, and altitude is measured in degrees from
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the horizon up to the Moon. Distance (Dist) is measured in units on Earth radii (1 Re is
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about 6370km). Note that this is a local coordinate system and will not be correct if the
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observer's latitude and longitude are not set correctly.
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.TP
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.B Fifth Page
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Shows the Moon's ecliptic coordinates. (i.e. the Right Ascention/Declination system).
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Useful for astronomers?
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.PP
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Many of the quantities shown will not be correct unless LT and UT are correct, and the user
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specifies the proper latitude and longitude.
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.SH OPTIONS
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.TP
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.B \-display <display>
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Use an alternate X Display.
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.TP
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.B \-bc
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Set background color. (E.g. #7e9e69 or blue)
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.TP
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.B \-lc
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Set color of text labels.
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.TP
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.B \-dc
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Set color of data values.
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.TP
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.B \-low
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Conserve colors. For 8\-bit displays, a lower\-color pixmap will be used automatically,
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but you can also force its use on higher\-color displays if necessary.
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.TP
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.B \-lat <Latitude>
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Observers Latitude in degrees. Positive in northern hemisphere, negative in southern hemisphere.
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.TP
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.B \-lon <Longitude>
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Observers Longitude in degrees. Greenwich is 0.0, and longitude increases positively
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toward the west. (Alternatively, negative numbers can also be used to specify
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longitudes to the east of Greenwich).
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.TP
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.B \-h
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Display list of command\-line options.
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.SH BUGS
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Who knows? (Let me know if you find any).
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.SH AUTHOR
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Michael G. Henderson <mghenderson@lanl.gov>
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